First, convert the MP3 to WAV file. Then, For u-law: sox -V output.wav -r 8000 -c 1 -t ul result.ulaw. For GSM: sox output.wav -r 8000 -c 1 result.gsm resample -ql. Pre-converting your input sound files usually give much better results than using internal modules for transcoding. When you want to convert typical MP3/WAV files for your PBX like Download ZIP. Command line bash to convert all wav to mp3. Raw. wav-mp3. for i in *.wav; do lame -b 320 -h "$ {i}" "$ {i%.wav}.mp3"; done. Sometimes we need to convert mp3 files into wav files and there are many different tools out there that do the same job, but which one to use? This short tutorial will teach you how to use the mpg321 commandline utility to convert your mp3 file into a wav file. Got around 2k audio files with sample rate 8k. Need to make an script to convert all the files to 16k Sample rate .For now Usig SOX for converting 1 file at a time. For eg. :-. sox 9560850166.wav -r 16000 -b 16 -c 1 file1.wav. Need an script so that next audio files will be selected from the directory and SOX will be done to change sample rate I want to send it to another audioplayer directly (also using subprocess) and it supports only wav files, I just find it more convenient to do it on the fly instead of converting everything and then play wav file(s). The player I send the avi file does support input on stdin. – Extract DTS audio from MKV file with gMKVExtractGUI. Drop DTS audio into the audio section of Megui and pick FFMPEG AC-3 (It can keep the original 5.1 and encode at 640kbps) Find the newly encoded AC3 file and mux into a new MKV with the video. Rinse and repeat. Quote. I learned how to encode wav into an mp3 using lame_encode_buffer_interleaved from this question: Is there any LAME c++ wraper\simplifier (working on Linux Mac and Win from pure code)? Now I want to decode the mp3 back into wav. I know there's lame_decode but I don't know how to use it since it requires two pcm buffers (pcm_l and pcm_r). I don't try using a decent burner like eroaster of gnome-toaster (or gcombust) which will autoamtically convert them for you. or use xmms's diskwriter output to write to wav, or use mpg123 / mpg321 or a billion other ways. xcdroast still sucks big time. 4W44FM.